Question

An aqueous solution of Sodium argentocyanide is preferred to silver nitrate solution as the electrolyte during the electroplating of silver

Answer 1

In Sodium argentocyanide ( Na[Ag(CN)2] ) the silver cation forms a complex so it isn't freely available as Ag+ in the electrolytic solution , this allows for a controlled electroplating as the only available source of Ag+ is the anode , however silver nitrate ( AgNO3 ) is a strong electrolyte so a large amount of Ag+ is already present in the electrolytic solution , if electroplating is done using this solution then electroplating will take place in an uncontrolled manner